[Solved] You need to design a system with a room type hierarchy where some rooms have special features like projectors or... How should you design the classes to keep the system scalable and maintainable? | LLD

LLD - Design — Hotel Booking System

You need to design a system with a room type hierarchy where some rooms have special features like projectors or whiteboards. How should you design the classes to keep the system scalable and maintainable?

AUse only one class for all rooms with many optional attributes

BCreate a base Room class with common attributes, then subclasses for each room type adding specific features

CCreate separate unrelated classes for each feature without inheritance

DPut all features in the base Room class and ignore subclasses

Step-by-Step Solution

Solution:

Step 1: Identify scalable design principles
Base class with common attributes avoids duplication; subclasses add specific features.
Step 2: Evaluate options
Putting all features in base or one class causes clutter; unrelated classes lose hierarchy benefits.
Final Answer:
Create a base Room class with common attributes, then subclasses for each room type adding specific features -> Option B
Quick Check:
Use base + subclasses for scalable design [OK]

Quick Trick: Base class for common, subclasses for specifics [OK]

Common Mistakes:

MISTAKES

Overloading base class with all features
Ignoring inheritance benefits
Using unrelated classes without hierarchy

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How should you design the classes to keep the system scalable and maintainable?

Step 1: Identify scalable design principles

Step 2: Evaluate options

Final Answer:

Quick Check:

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